Rotary jar



G. P. ELLIS April 28, 1953 ROTARY JAR Filed Feb. 21, 1950 Patented Apr. 28A, 1953 PAT ENT @OFFICE vROTARY JAR Guy PsEllis, Lake "Charles, La.

,gipplctionjliebruary 21, 1950,Seria1 No: 1545;,426

i'lf'Claim. il

Thisinvention-re1ates tofajjar-,foruse in drilling wells sli-clinforexanipley'as yoilwells.A

In "connection with -fthe drill-ing uof oil `wells :numerous deviceshaye been employed inthe past rremovnggpakerswhih :often Aioeome stuck zteruremainin, inrol- .wellsfiforfsome time,-by the yprncess of;iarrinefrthevimplement; buty in al1-such @devices it1hasfbeen--ne cessary to -iirst remove the tubingihycutting or1othermmea-ns, and thenrun Jin -the fjars in connection lwithsor'neftype of fiishing tool.

A principal ohjectottheupresent invention is *to jjprovide an improved Ljarring device which is fdesigned At-o fbde i installed jin an roil wellin connecrtion with 'the production Mstring, which is :Comr:monlyfreierredtoasithetubinefan@packenwhere suchtowingdevicefremainszuntil SuChzt-.imeasit rmaybe -:1f,equ;i-red-=for use in the Ievent that the =;nackeribeeomesstuck.

nnot-herohjectgofthe invention;istoj-providean improved jarring :device for Vuse 1 in #the manner .above"Stated,V which is designedA in .ii-nova mam `"ner whereloy -all of ;the working parts f.are -maintained Aenclosed and sealedinfa lubricant -to pre- ,vent corrosion -so thatthe ldevioemay remain in the i well llover anti-ndeiinite period of l'time `without in any way "becoming damaged or -f unt `'for .use.

Other-objects and advantages of Sthefinvention willbeoorne apparent as the jdescription -of fthe same proceeds and i-the `invention -`will be ibest understoodfrom@a-oonsideration off-theffollowijng :detailed description-1 takenfin connection with lthe accompanying fdrawing forming ;;a g-part lof the specieatiod with the understanding, howeV-er, itl-,iat ithe iinvention gis not fito f'bef-li1rni,ted @to the @exact `details of 1construotion shown and de- "iolbed since obvious modifications AAwill -occur -to aipersoniskilledfin Jthe art.

nIl iitlie drawing:

, Figure 1 iis a view insideielevationfof '-a-rotary` iariconstructedin accordance with the present Referring more particularly to the drawing the numeral I0 designates the lower portion of a production string or tubing.

(Cl.:255f27) 2 The rotaryjarring deviceof the present-'invention is connected'to the lower end Aof `the Vstring vI8 -and forrnsrla permanent part thereof. This device is generally :designated I I :and it comprises` along tubular-hammer `shank |12 whichhas its upper -end-threadably engaged'in the lower end of the string as indicated at I3.

Upon the lower end `of the shank I2` is the'hammer which-s of v-larger outside diameter-than 'the shank I 2 and of `circular cross seotionias shown in'Figure 3. This hammer-'is formedat its lower endto provide the'taperedwalveshoulder I5while at itsupperend theregisiormedithe encircling `hammering shoulder I6,the lfunction of which will be hereinafter set forth. Theshank and the 4hammer -proper l have a `passa-ge I7 `:exl tendingl entirely therethrough.

' The hammer M `also has `formed therein #the her I 9- which extends transversely" offthe hammer and which has Aan overall flength i greater :than the diameterfof'the hammer `as shown .in Figure "2. 'Thusinthe tool as'assem'hled,thezkeyfl 9 has ka portionfof :each endifprojecting beyondithe side Aof the hammer I4 `for the purpose hereinafter described.

The i numeral 20 designates a@ barrel in which the yhammer I4 isslidably-positioned. This bar- `relatitsflower `end is of :slightly reduced-inside diameter asindicated-at'Z I whereby thereis pro- `vided-the annular iseat-22upon whichithe valve shoulder I5 rests when the tool is -1 installed in the well hole.

The lower end of the barrel 20 is also externally ireduced and screw threaded as-atl23for1the attachment Vof a l'packer-or another section Vof Athe 'wellstringfthereto.

At itsupper end fthebarrelhas itsinsidediameter enlarged i slightly and `screw threaded )as at24-so that,jas^will` be `readily seen, the hammer maybe easily insertedinto the barrel.

Thewall of thebarrel 20 has formed ftherevthrough the Adiametrcally opposite longitudinal slots i2-5in which the extended ends ofthe LkeyfI 9 `are engaged. These slots are straight andin'line `transversely i of the barrel throughapproximately ytheiupper half of their'lengthslbut the lower end offeachslot has an offset undercut `shoulder 26 onfonefside whilea't theopposite side-below Hthe shoulder, `the side ,ofitheslot is sloped to extend Aoblique `to theilengthjof `the barrel Mto provide a `eainrning surfe-c5312?. Thusit will-be-seenthat thelower 4end Aof A each slot-iis of i increased width through a portion of its length and then slowly tapers 01T on one side only so that at its lower end its width is approximately the same as the upper end. The shoulders 26 are extended in 3 the same direction circumferentially of the barrel and thus it will be seen that when the hammer is in the lower part of the barrel the key will slide down the inclined camm'ing surfaces 21 so as to turn the hammer and bring each end of the key under a shoulder 26.

After the hammer has been inserted into the barrel there is threaded intovthe upper end of the barrel the collar 28 which was previously placed on the shank and when this collar has been threaded in as far as it will go it will be seen that it prevents the hammer from escaping from the barrel.

The inner end of the collar 28 is provided with the sloping shoulder 29 which is of the same diameter of the shoulder I6 of the hammer and this shoulder forms an anvil against which the upper end of the hammer strikes in the use of the tool.

The upper part of the collar 28 is cut out or made of an enlarged diameter as at 30 to receive a packing 3i and above the packing the collar is internally screw threaded to receive a gland nut 32 which also, of course, encircles the hammer shank I2.

Externally the barrel is of slightly reduced diameter starting just below the internally reduced portion 24 thereby forming a shoulder 33. Below this shoulder the barrel has snugly fitted f thereon, the sleeve 34, the upper end of which butts against the shoulder 33 as shown. This sleeve completely covers the slot-s 25;

When the tool is introduced into the string, the hammer I4 is in its lowermost position so that the valve I5 will be resting upon the seat 22. In this position there are extended through the lower 'end of the sleeve 34, from opposite sides, the shear pins 35 which pass through the sleeve and through the lower part of the barrel and into the hammer as shown in Figure 2. Thus ythe hammer is secured in the lower end of the barrel 20 until such time as it becomes necessary to break the shear pins and put the jar into operation. After the hammer has been secured by the shear pins 35 in the lower end of the barrel 20, the barrel above the hammer and the slots 25, are

f packed or filled with suitable lubricant L and the collar 23 is then turned down to tightly close the top of the barrel whereby to prevent the lubricant from escaping. The sleeve 34 has such close fit upon the barrel as to retain the lubricant therein.

It will be readily apparent that the jarring tool normally forms a part of the well string. However, if the packer at the lower end of the jarring tool becomes stuck or frozen the tool may be put into use to release the packer, by applying the f necessary upward pull on the string whereby to break or shear off the pins 35. This will release the hammer I4 which can then be ydrawn up to the top of the barrel 20 and during such movement the encased lubricant will escape into the lower part of the barrel by way of the slots 25.

To put the tool into use for jarring loose the packer, the string is lowered until the ends of the key I9 enter the lower ends of the slots 25 which will effect the desired partial turning of the hammer. The tool is then drawn up and, since the turning of the hammer has placed the ends of the key I9 beneath the shoulders 26, the top of the key at each end, which is slightly sloped or inclined as shown, will engage against the shoulders 26. By continuing the upward pull so as to firmly contact the ends of the key with the shoulders 25 and then applying a slight torque to the pipe string the key ends will disengage or slip oi of the shoulders 26 and the hammer will be rapidly elevated and will come into forcible contact With the anvil 29 as shown in Figure 4. It will be readily seen that this operation may be repeated as many times as may be necessary in order to effect the loosening of the stuck packer.

It will be seen from the foregoing that there is provided in the present invention a rotary jar which can be maintained in the well hole as a permanent part of the tubing string so that when the necessity for using a jar arises it is not necessary to pull out the tubing and run in a jar on a separate line as is at present done since the production string may then be put to use for actuating the jarring tool.

While the improved jar herein set forth has been described in combination with a tubing string, an-d such combination constitutes a novel feature of the invention and is-so claimed, itis to be understood that the invention is not intended to be limited to such combination since the jar device in itself is of novel construction and such construction is claimed apart from the combination.

I claim:

A rotary jar, comprising a barrel having a reduced inside diameter at its lower end providing an insidevalve seat, the top end of the barrel having an increased inside diameterl through ya portion of its length, a cylindrical hammer slidably positioned in the barrel and having its lower end formed to provide a valve -to position on said valve seat, a long stem carried by the hammer and extending through the topend of the barrel, a collar encircling the stein and extending into and secured in the said part of enlarged diameter at the top end of the barrel, said collar having a portion of its lower formed to provide an anvil against which the top end of the hammer strikes, means carried by the collar and encircling the stem forming a leak proof seal around the stem, said barrel having a slot longitudinally of the wall thereof, said slot being of increased width in the lower part thereof to form onone side-of the slot a downwardly directed shoulder, a key er:-

tending radially from the hammer and into the slot and adapted to be engaged against said shoulder by a partial rotation of the hammer, releasable means for securing the hammer in the lower part of the barrel with the valve on the seat, a sleeve encasing the barrel and closingT the outer part of the slot, and a corrosion resistant material filling the barrel above the hammer when the hammer is inthe said lower part of the barrel.

l GUY P. ELLIS. References cited in the fue of this patent UNITED STATES PATENTS Number Name Date 871,258 Criswell Nov. 19, 1907 1,889,283 Francis Nov. 29, 1932 2,158,406 Collett et al May 16, 1939 2,265,431 Kerr Dec. 9, 1941 2,501,025 Burris Mar. 21, 1950 

